diff -r 71ca22bcf22a -r 5a06f39ad45b khronosfws/openmax_al/src/common/xametadatatraversalitf.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/khronosfws/openmax_al/src/common/xametadatatraversalitf.c	Fri Apr 16 15:29:42 2010 +0300
@@ -0,0 +1,304 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include "xametadatatraversalitf.h"
+#ifdef _GSTREAMER_BACKEND_  
+#include "XAMetadataAdaptation.h"
+#endif
+/* XAMetadataTraversalImpl* GetImpl(XAMetadataTraversalItf self)
+ * Description: Validate interface pointer and cast it to implementation pointer.
+ */
+static XAMetadataTraversalImpl* GetImpl(XAMetadataTraversalItf self)
+{
+    if( self )
+    {
+        XAMetadataTraversalImpl* impl = (XAMetadataTraversalImpl*)(*self);
+        if( impl && (impl == impl->self) )
+        {
+            return impl;
+        }
+    }
+    return NULL;
+}
+
+/*****************************************************************************
+ * Base interface XAMetadataTraversalItf implementation
+ *****************************************************************************/
+
+/* XAresult XAMetadataTraversalItfImpl_SetMode
+ * Description: Sets the metadata traversal mode
+ */
+XAresult XAMetadataTraversalItfImpl_SetMode(XAMetadataTraversalItf self,
+                                            XAuint32 mode)
+{
+    XAMetadataTraversalImpl *impl = NULL;
+    XAresult res = XA_RESULT_SUCCESS;
+
+    DEBUG_API("->XAMetadataTraversalItfImpl_SetMode");
+    impl = GetImpl(self);
+    /* check parameters */
+    if( !impl  ||
+       (mode!=XA_METADATATRAVERSALMODE_NODE &&
+        mode!=XA_METADATATRAVERSALMODE_ALL))
+    {
+        DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
+        res = XA_RESULT_PARAMETER_INVALID;
+    }
+    else if(impl->traversemode != mode)
+    {
+#ifdef _GSTREAMER_BACKEND_  
+        res =XAMetadataTraversalItfAdapt_SetMode(impl->adaptCtx, mode);
+#endif
+        if( res == XA_RESULT_SUCCESS )
+        {
+            impl->traversemode = mode;
+        }
+    }
+    else
+    {
+        /* do nothing */
+    }
+
+    DEBUG_API("<-XAMetadataTraversalItfImpl_SetMode");
+    return res;
+}
+
+/* XAresult XAMetadataTraversalItfImpl_GetChildCount
+ * Description: Returns the number of children (nodes, streams, etc.) within the current scope
+ */
+XAresult XAMetadataTraversalItfImpl_GetChildCount(XAMetadataTraversalItf self,
+                                                  XAuint32 *pCount)
+{
+    XAMetadataTraversalImpl *impl = NULL;
+    XAresult res = XA_RESULT_SUCCESS;
+
+    DEBUG_API("->XAMetadataTraversalItfImpl_GetChildCount");
+    impl = GetImpl(self);
+    if( !impl || !pCount )
+    {
+        DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
+        res = XA_RESULT_PARAMETER_INVALID;
+    }
+    else
+    {
+        if(impl->traversemode==XA_METADATATRAVERSALMODE_ALL)
+        {
+            /* for this mode, child count is always 0 */
+            *pCount = 0;
+            res = XA_RESULT_SUCCESS;
+        }
+        else
+        {
+#ifdef _GSTREAMER_BACKEND_  
+            res = XAMetadataTraversalItfAdapt_GetChildCount(impl->adaptCtx, pCount);
+#endif
+        }
+    }
+
+    DEBUG_API("<-XAMetadataTraversalItfImpl_GetChildCount");
+    return res;
+}
+
+/* XAresult XAMetadataTraversalItfImpl_GetChildMIMETypeSize
+ * Description: Returns the size in bytes needed to store the MIME type of a child
+ */
+XAresult XAMetadataTraversalItfImpl_GetChildMIMETypeSize(XAMetadataTraversalItf self,
+                                                         XAuint32 index,
+                                                         XAuint32 *pSize)
+{
+    XAMetadataTraversalImpl *impl = NULL;
+#ifdef _GSTREAMER_BACKEND_  
+    XAuint32 chCount = 0;
+#endif    
+    XAresult res = XA_RESULT_SUCCESS;
+
+    DEBUG_API("->XAMetadataTraversalItfImpl_GetChildMIMETypeSize");
+    impl = GetImpl(self);
+
+    if( !impl || !pSize)
+    {
+        DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
+        res = XA_RESULT_PARAMETER_INVALID;
+    }
+    else
+    {
+#ifdef _GSTREAMER_BACKEND_  
+        res = XAMetadataTraversalItfAdapt_GetChildCount(impl->adaptCtx, &chCount);
+        if(index >= chCount || res != XA_RESULT_SUCCESS)
+        {
+            /* out of bounds */
+            res = XA_RESULT_PARAMETER_INVALID;
+        }
+        res = XAMetadataTraversalItfAdapt_GetChildMIMETypeSize(impl->adaptCtx, index, pSize);
+#endif
+    }
+
+    DEBUG_API("<-XAMetadataTraversalItfImpl_GetChildMIMETypeSize");
+    return res;
+}
+
+/* XAresult XAMetadataTraversalItfImpl_GetChildInfo
+ * Description: Returns information about a child
+ */
+XAresult XAMetadataTraversalItfImpl_GetChildInfo(XAMetadataTraversalItf self,
+                                                 XAuint32 index,
+                                                 XAint32 *pNodeID,
+                                                 XAuint32 *pType,
+                                                 XAuint32 size,
+                                                 XAchar *pMimeType)
+{
+    XAMetadataTraversalImpl *impl = NULL;
+#ifdef _GSTREAMER_BACKEND_  
+    XAuint32 chCount = 0;
+#endif
+    XAresult res = XA_RESULT_SUCCESS;
+
+    DEBUG_API("->XAMetadataTraversalItfImpl_GetChildInfo");
+    impl = GetImpl(self);
+    if( !impl || !pNodeID || !pType )
+    {
+        DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
+        res = XA_RESULT_PARAMETER_INVALID;
+    }
+    else
+    {
+#ifdef _GSTREAMER_BACKEND_  
+        res = XAMetadataTraversalItfAdapt_GetChildCount(impl->adaptCtx, &chCount);
+        if(index >= chCount || res != XA_RESULT_SUCCESS)
+        {
+            /* out of bounds */
+            DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
+            DEBUG_API("<-XAMetadataTraversalItfImpl_GetChildInfo");
+            return XA_RESULT_PARAMETER_INVALID;
+        }
+        res = XAMetadataTraversalItfAdapt_GetChildInfo(impl->adaptCtx, index,
+                                                pNodeID, pType, size, pMimeType);
+#endif
+    }
+
+    DEBUG_API("<-XAMetadataTraversalItfImpl_GetChildInfo");
+    return res;
+}
+
+/* XAresult XAMetadataTraversalItfImpl_SetActiveNode
+ * Description: Sets the scope to a child node
+ */
+XAresult XAMetadataTraversalItfImpl_SetActiveNode(XAMetadataTraversalItf self,
+                                                  XAuint32 index)
+{
+    XAMetadataTraversalImpl *impl = NULL;
+#ifdef _GSTREAMER_BACKEND_  
+    XAuint32 chCount = 0;
+#endif
+    XAresult res = XA_RESULT_SUCCESS;
+
+    DEBUG_API("->XAMetadataTraversalItfImpl_SetActiveNode");
+    impl = GetImpl(self);
+    if( !impl )
+    {
+        DEBUG_ERR("XA_RESULT_PARAMETER_INVALID");
+        res = XA_RESULT_PARAMETER_INVALID;
+    }
+    else
+    {
+#ifdef _GSTREAMER_BACKEND_  
+        res = XAMetadataTraversalItfAdapt_GetChildCount(impl->adaptCtx, &chCount);
+        if( res == XA_RESULT_SUCCESS )
+        {
+            if((impl->nodedepth==0 && index==XA_NODE_PARENT) ||
+                (index >= chCount && index!=XA_NODE_PARENT))
+            {
+                /* try to ascend from root or descend to nonexistend child node */
+                res = XA_RESULT_PARAMETER_INVALID;
+            }
+            else
+            {
+                /* update node and childs */
+                res = XAMetadataTraversalItfAdapt_SetActiveNode(impl->adaptCtx, index);
+                if( res == XA_RESULT_SUCCESS )
+                {
+                    if(index==XA_NODE_PARENT)
+                    {
+                        impl->nodedepth++;
+                    }
+                    else
+                    {
+                        impl->nodedepth--;
+                    }
+                }
+            }
+        }
+        else
+        {
+            DEBUG_ERR("XA_RESULT_INTERNAL_ERROR");
+            DEBUG_API("<-XAMetadataTraversalItfImpl_SetActiveNode");
+            return XA_RESULT_INTERNAL_ERROR;
+        }
+#endif        
+    }
+
+    DEBUG_API("<-XAMetadataTraversalItfImpl_SetActiveNode");
+    return res;
+}
+
+/*****************************************************************************
+ * XAMetadataTraversalImpl -specific methods
+ *****************************************************************************/
+#ifdef _GSTREAMER_BACKEND_  
+
+/* XAMetadataTraversalImpl* XAMetadataTraversalItfImpl_Create()
+ * Description: Allocate and initialize XAMetadataTraversalImpl
+ */
+XAMetadataTraversalImpl* XAMetadataTraversalItfImpl_Create( XAAdaptationBaseCtx *adaptCtx )
+{
+    XAMetadataTraversalImpl *self = NULL;
+    DEBUG_API("->XAMetadataTraversalItfImpl_Create");
+
+    self = (XAMetadataTraversalImpl*) calloc(1,sizeof(XAMetadataTraversalImpl));
+
+    if( self )
+    {
+        /* init itf default implementation */
+        self->itf.SetMode = XAMetadataTraversalItfImpl_SetMode;
+        self->itf.GetChildCount = XAMetadataTraversalItfImpl_GetChildCount;
+        self->itf.GetChildMIMETypeSize = XAMetadataTraversalItfImpl_GetChildMIMETypeSize;
+        self->itf.GetChildInfo = XAMetadataTraversalItfImpl_GetChildInfo;
+        self->itf.SetActiveNode = XAMetadataTraversalItfImpl_SetActiveNode;
+
+        /* init variables */
+        self->adaptCtx = adaptCtx;
+
+        self->self = self;
+    }
+    DEBUG_API("<-XAMetadataTraversalItfImpl_Create");
+    return self;
+}
+#endif
+/* void XAMetadataTraversalItfImpl_Free(XAMetadataTraversalImpl* self)
+ * Description: Free all resources reserved at XAMetadataTraversalItfImpl_Create
+ */
+void XAMetadataTraversalItfImpl_Free(XAMetadataTraversalImpl* self)
+{
+    DEBUG_API("->XAMetadataTraversalItfImpl_Free");
+    assert(self==self->self);
+    free(self);
+    DEBUG_API("<-XAMetadataTraversalItfImpl_Free");
+}